Boat hull tunnel



FIG. 1 is a top perspective view of a boat hull tunnel showing my new design, the broken line illustration of a boat hull being for illustrative purposes only, and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof, and a left side elevational view is a mirror image thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a boat hull tunnel, as shown and described. 